Signal transmitter



May 3, 1938.

i SIGNAL TRANSMITTER Filed sept. 21, 1935 4'sheets-sheet 1 .E \`l-llllllllvlllllllly f1 55 W /qfaa l F. E. wELD 2,116,372

May 3, 1938.

F. E. WELD 2,116,372

S IGNL TRANSMITTER Filed Sept. 2l, 1935 Sum 4 Sheets-Sheet 3 May 3,1938. F, E WELD 2,116,372

S IGNAL TRANSMITTER Filed Sept. 2l,- 1955` 4 Sheets-Sheet 4 QM/Wim@Patented May 3, 1938 .SIGNAL TRANSMITTER Foster E. Weld, Newton, Mass.,assignor to The Gamewell Company, Newton Upper Falls, Newton, Mass., acorporation of Massachusetts Application September 211933, Serial No.690,408

12 Claims.

The `present invention relates to devices for transmitting code signalsof the type which are used in fire alarm systems and similar circuits.Such installations permit the sending of code 5 numbers by consecutivelyenergizing and deenergizing a circuit at certain 'intervals grouped withintervening pauses of varying length, and representing the digits ofnumbers of known significance. It is often desirable to' distribute orrepeat such code signals in the simplest possible manner.

'For example, the telephone exchange of a community may be'organized fortransmitting in the form of code signals, alarm messages orally receivedfrom the subscribers over the ordinary telephone network. A person maydiscover a lire, thereupon call the exchange and report the occurrenceto the operator, who immediately notifies the fire department of thealarm.

It is highly desirable to provide the telephone operator with means fortransmitting the alarm in a'manner that is customary in the firelighting service, namely, as code number signals mani` fested as bellstrokes and/or recorded on tape. 7, Hence, thel telephone operator mayselect, for example Vwith the aid of charts or tables, vthe code signalstanding for the locality. from which the alarm was receivedand'transmitfthis signal to the re department.

vIt is therefore one of the principal objects of the present inventionto provide apparatus forv sending variable code number signals in thesimplest possible manner, thereby reducing the operators activity to aminimum and excluding 5 to a very high degree the possibility of makingerrorsin the transmission of the signals.

With the aid of the equipment according to this invention, the telephoneoperator, after receiving the call and selecting a number associated-With the location of the re, sets up this number and,O if desired, anadditional special number of a prearranged meaning, with the aid of adigit setting device, upon which he can visualize the number, presses abutton and thereby initi- -v ates transmission of the number repeatedany desired number of times. Or according to one embodiment of theinvention, the telephone op-Y erator may dial the number once on aconventional telephone dial, whereupon the signal is transmitted apredetermined number of times to the re authorities without any furtheractivity by the operator. It `is further feasible to connect the newapparatus to a conventional signal manifesting device and to repeat anyone incoming code number as often as desired.

such numbers with the aid of a conventional Accordingly, further objectsof my` invention are to provide means for setting up a code signalV bymanually establishing certain electric connections representing codenumbers or by dialing telephone dial switch; to provide means forsubsequently transmitting the set up signals a desired number of times,the transmission being initiated automatically when the complete signal'is set up, or by a simple manipulation as, for example, pressing aswitch button; and to provide means for automatically` storing codesignals manifested in a conventional alarm or similar circuit and thentransmitting these signals.

In another aspect, the invention contemplates a signal circuit connectedwith a device sending into the circuit current impulses at regularintervals and having instrumentalities which prevent the eiectiveness ofcertain of those impulses, thereby forming signals according to aprearranged code.

In a further aspect, the invention provides an automatic signal storingand transmitting device which is comparatively simple and reliable,v dueto the utilization of conventional telephone selector switches.

These and other objects and aspects of the invention will be apparentfrom the following detailed explanation illustrating the genus of theinvention with reference to several concrete embodiments thereof. Thedescription refers to drawings in which- Fig. l is a circuit diagram ofa variable signal sender with manual digit setting device andindependent starting device;

Fig. 2 is a circuit diagram of a variable signal sender includingmeans.for automatically storing and retransmitting a signal receivedeither from a signal manifesting device or-a telephone dial;

Fig. 3 is a simplied straight line diagram incorporating part of thecircuit according to Fig. 1;

Fig. .4 is the diagrammatic representation of a 'signal stored andtransmitted with apparatus according to Fig. 2; and

Fig. 5 is a simplied diagram similar to Fig. 3, of part of the automaticdigit setting device incorporated in the modification according to Fig.2.

'I'he circuit which is diagrammatically shown in Fig. 1 comprisesbattery B, starting key K,4 impulse sender I, maintenance relay M,stopping relay S, alarm relays R, R', change-over switch O, controlrelay C, limiting relay L, transmitting, 55

as battery B, supplies the system with current.

In order to simplify the circuit diagrams, the individual connectionswith the power source have not been shown in Figs. 1 and 2, but thepoints of the circuit which are supplied with current have beenindicated by appropriate polarity signs, these points being assumed tobe in conducting connection with the respective poles of thev battery.

- these members.

'I'he starting key K consists of two resilient switch members and |02separated by an insulating block |00 and preferably designed as a pushbutton switch permitting simultaneous actuation of members I0| and |02which cooperate with contacts |03 and |04, respectively. The respectivemembers contact upon pressing the button, and connection is interruptedwhen the push button is released. Itk is understood that these contactsor similar organs may be operated in a different manner, for example, bymeans of a. magnet, as shown in the modification according to Fig. 2.

The impulse sender I has the purpose of sup- Dlying the system accordingto the inventionl at regular intervals with current impulses. Anyarrangement adapted to this purpose may be used, but in theherein-described embodiment I eni ploy rotating impulse switches |20 and|30. Switch |20 comprises a cam disk of insulating material, with raisedportions ||3 and lower portions ||2. The cam disk actuates al followerswitch ||4 which rests against a starting contact ||5 if sliding on thelower c'amportions 2, but leaves ||5 and connects with an impulsecontact ||6 when raised by cam portions ||3.

Disk is fastened to shaft |2|, driven by motor |22 herein assumed to bea' self-starting synchronous motor with rotor |24 and stator |25. Asecond impulse switch |30 is quite similarly constructed to shaft |2|,;fsk |3| being similar with the difference that. itrv has only camportion. i and,|36 corresponding to members ||4, ||6, respectively, inthe manner described above for Switch |30 supplies the system withcurrent impulses at one-half the frequency of the impulses provided byswitch |20, as will be apparent without further explanation.

The maintenance relay M consists in' substance a maintenance Imagnet 4|controlling normally to disk i one raised open switches 42, 43, 44,respectively, which close upon energization of magnet 4|.

Stopping relay S comprises a stopping magnet 5| and a three-contactstopping switch 50 of the make-before-break type. Normally, movablecontact 52 connects with fixed contact 53 which is joined to thepositive pole of battery B.

for example, equipped with a copper sleeve of well known retardingeffect and, if energized, attracts armature contact 54 which reachesmovable contact52 before" it lifts the latter from fixed contact 53.

The alarm relays R and R are representative of devices suitable totransmit signal impulses to' conventional signal manifesting apparatusor circuits, as registers, signal bells or repeater circuits as-commonlyused in re alarm systems. In

andy has a disk |3| also keyedv It cooperates 4with contacts |35 theretarded releasevtype, being,

the present instance', it may be assumed that the magnets of relays R,R' are normally energized, and upon deenergization cause manifestationof one signal element, for example, the stroke of a bell.

Alarm relays R and R can be selectively connected either to the slowrunning impulse switch |30 or the fast running impulse switch |20,respectively, by means of change-over switch O, comprising movablecontacts 6 I, 62 and fixed contacts 63, 64, 65. 66, which are connectedto contacts |36, H6, and relays R, R', respectively. In the positionshown in Fig. l,v contacts 6|, 62 connect the quick acting impulseswitch |20 to relay R. By shifting members 6|, 62 to contacts 63, 65,slow acting impulse switch |30 can be con nected to relay R.

Switch member 62 is'connected to limiting relay L through' lead 1|, andmember `6| is connected through lead 12 to the fixed contact of switch44 of maintenance relay4 M. The terminals of relays R, R' which are notconnected to contacts 65, 66, respectively, are joined, and connectedthrough lead 13 to control relay C.

'Ihe stator |25 of motor |22 is supplied from a suitable source ofcurrent, in the present embodiment alternating current derived from atransform'er |29, by means of leads 14, 15 and 16. Wire 14 is connectedintermediate stator |25 -and starting key contact |04. Wire 16 joinstransformer |29 and starting key member |02. Lead 15 connects the otherterminal of transformer lThe corresponding fixed contact |03 isconnected through wire/16 to magnet 4| of maintenance relay M, whoseholding circuit including switch 42 has been described above. Lead 16 isfurther branched' into lwire 19 leading to relays C and L.

It will now be apparent, that, when the starting button is pressed,switch |0||03 connects the motor circuit and starts motor |22 and thatswitch |02|04 sets up the following circuit. If follower switch 4 ofimpulse sender I happens to be in the lower position as shown, or assoon as it arrives in that position (the motor being already started),it connects starting contact ||5 and lead 80'with the positive pole ofthe battery, .and through switch |0||03, lead 10 and magnet 4|.connectswith the negative pole, thereby energizing maintenance magnet 4|.mediately closes its switches and remains in that position after thestarting key is released, due to Magnet 4| imthe holding circuitestablished through switch 42,

from positive at fixed 'contact 53 of stopping relay S through 52, lead0|, switch 42, magnet 4| vvto negative. 'I'his holding circuit remainsclosed, ,and magnet 4| energized, as long as contact 52`of maintains aCircuit from the impulse sender I through change-over switch O and lead12 to impulse wire 11.

The controlI relay C consists of a magnet |4I, two armature contacts |42and |43, spring contact IM and two fixed contacts |45 and |43.

Contact |43 is connected to the aforementioned wire 11, contact |42 isconnected` to one terminalv of magnet I4| (whose'other terminal isjoined to lead 19), and contact |43 is connected to leads 13 and 86. Innormal position, as shown in Fig. 1, when magnet |4I is deenergized,contacts |44, |45 and |433, |46, respectively, are connected, whereascontacts |42 and |44 are separated. Upon energization of magnet Mi,armature contacts |32 and |43 are attracted and contact at Mii- |46 isinterrupted. Member `|42 establishes effective connection with springcontact |44, before it removes the latter from fixed contact |45, sothat connection is established at |44 before contact is broken at |45.

" Ihe limiting relay L consists of a magnet which controls threearmature contacts |52, |53, i

|54 associated with four fixed contacts |55, |56 and |51, |58,respectively. Under normal conditions, as shown, when magnet I5|isdeenergized, contact pair |52, |55 is separated, contact pair |53, |53is connected and armature contact |54 which cooperates as change-overelement with xed contacts |51, |58, rests against contact |58. Uponenergization of magnet I5|, contact is established at I52-|55, contactis broken at |53-|56, and switch |54 changes from contact |58 to contact|51.

One terminal of magnet I5I is connected to lead 19Yand the correspondingterminal of magnet |4| of control relay C. The other terminal of magnetI5I is connected to xed contact |55.

Armature contact |52 and fixed contact |51 are on the negative pole ofthe battery. Armature switch |53 is joined by lead B2 to fixed contact|46 of control relay C. Fixed contact |56 connects with change-overswitch O through the aforementioned lead 1|;

Transmitting switch T and pause switch P are telephone selector switchesof the Well known ty-pe which consecutively connect a number of contactsstep by step with a common terminal. The function of the transmittingswitch T is to count the number of strokes in each digit while that ofthe pause switch P is` to cause the digits of a signal to be transmittedin proper sequence and with proper pause intervals between each digit.

. These switches are, therefore, also referred to as impulse countingswitch and sequence switch", respectively. Referring more particularlyto transmitting switch T, this mechanism comprises three selector unitsI|, |2 and -I3, each having a series of selector contacts, and wipers2|, 22, 23, respectively, the three wipers being mechanically connectedto move in unison. In order to simplify drawings and description, theselector contacts are herein designated by their position withintheselector unit, combined with the selector unit'f'nurneral,` bothnumerals' being separated by a' colon, so that, for example, the tenthcontact of selector,v switch i2 will be referred to as contact |il:|2.

The wipers normally contact with the first selector contacts of therespective unit and are advanced by means of an actuator magnet 3|operating a stepping switch 32 which contacts with actuator contactl 33,connected to the negative pole of the battery, if magnetv 3| isd'eenergiz'ed.

, The magnet and its armature, that is, stepping switch 32, are soorganized that the `three wipers of the transmitting switch are advancedone single step, from onecontact to the adjacent one, upon eachdeenergization of the actuator magnet. Such selector switches are wellknown in the telephone art and need not be described more in detail. Itshould, however, be observed that wiper 2| should be of themake-before-break type. For example, it may have sliding contacts orbrushes sufficiently wide to touch the next contact before they leavethe preceding one. Recapitulating the `operation of this switch, itremains at rest so long as magnet 3| is energized, under which conditionstepping switch 32 is separated from xed contact 38. Upon deenergizationof the magnet, stepper 32 is retracted therefrom by suitable means,advances wipers 2 I, 22, 23 one step and contacts with xed contact 38.If lead 83 is disconnected from the energy supply, 3| is againenergized, 32 attracted, and so on, stepper 32 vibratingand advancingthe wipers quickly (preferably within one impulse of |29 or |30) overthe selector contacts.. If, however, lead 33 is connected to negative,stepper 32 remains attracted to magnet 3| as long as the latter isenergized, regardless of the'interruptions at 38. The wipers restnormallyvupon the first contacts of their respective selector units, asshown in the drawings.

Pause switch P is constructed similar to trans-- mitting switch T,having three selector units I 4, I5, I6 with wipers 24, 25, 26,respectively, and corresponding rows of selector contacts which will beidentified by double numbers like the selector contacts of switch T.Actuator magnet 34, stepping switch 35 with xed contact 39 (connected tolead 89), and the wipers 24, 25, 26, operate in the same manner as thecorresponding elements of the transmitting switch. Like the wipers ofswitch T, the members 24, 25, and 26 rest initially at the respectivefirst selector contacts. Both switches have conventional sparksuppression arrangements 33 and 31, respectively, bridging contacts 32,38 and 35, 39, respectively. Confl tacts 39 and 35 are normally bridgedthrough leads 89 .and 94 and contacts |54--I59 of limit-A ing relay L.

The digit setting device D may consist of any instrumentality forselectively connecting a se ries of conductors (in the present instancenumber busses Il to 9) with a second series of conductors (in thisembodiment digit busses h, t, u; h', t', u).` This might beaccomplished, for example, by connecting a flexible wire ending in aplug `to each digit bus and by providing each number buswith as manyplug receptacles as digit busses are used. Each digit bus could then bepluggedinto any of the number busses. Or,. v

the two bus series can be arranged on two sides of an insulation paneland holes drilled through busses and panel at each crossing of theformer. Metal plugs can then be inserted at any crossing forestablishing contact between any pair of number and digit busses. InFig. 1, an arrangement of the latter; type is diagrammatically shown,the plug connections being indicated with full dots. In the presentinstance, it is assumed that a special number group consisting of acurrent impulse series arranged to represent a nurnber with threedigits, namely hundreds, tens and units, should be transmitted, followedby similarly constituted signals representing a `box number.Accordingly, there are ten number busses Il to 3, three special signaldigit busses h, t, u.; and three box number digit busses h', t', u.example, intended to set up and to transmit a If it is, for

mission of more than two different numbers. It

will also be apparent that the apparatus may be simplified by providingfor a single number, when only three digit busses are required.

As shown in Fig. 1, one terminal of each actuating magnet 3| and 34,respectively, is connected to the aforementioned lead TI, whereas thetwo other terminals of these magnets are connected to the respectivestepping switches. 'I'he stepping switch 32 of selector T is connectedthrough wires 83 and 85 towiper 23 of selector switch I3 and throughwires 83, .84 to contact |:|2, which is part of a group of electricallyinterconnected contacts, as shown in Fig. 1. Contacts I:|| to I: I I ofselector switch I| are similarly interconnected and electrically joinedto armature switch |44 of control relay C, by means of lead 86. Contact22:|| is connected, through lead 89, to stationary contact 39 of switchP and to armature switch member |54 of limiting relay L. Wiper 2| ofselector switch II is electrically linked to the negative pole of thebattery, and wiper 22 of selector switch I2 is connected through lead 81to xed contact |45 of control relay C. Contacts |:I3 to I0: I3 lead tonumber busses 0 to 9, respectively. Contacts II: |3 to 2|: I3-areinterconnected and joined to contact 3: I5 of relay P,

by means of lead 88. Contacts 22: I3 and 23: I3

are interconnected and joined to the negative pole of the battery.

The wiper 24 of selector unit I4 (switch P) is supplied from thepositive pole of the battery. The contact 23: I4 of the same unit isconnected through lead 9| to armature contact 54 of stopping relay S andwith it to one ter'minal of magnet whose other terminal is connected tothe negative terminal of the battery.

The wiper 25 of selector switch I5 is supplied from the negative pole ofthe battery. 'Ihe contacts of this selector switch are in the presentexample interconnected as follows: 3: I5to 6: I5, 9: I5, |2:|5 andI5:I5, always omitting two contacts. Contact 3: I5 is further connectedthrough lead 88 to contact 2|:|3, as heretofore mentioned. Contacts4:I5, 'I:I5, I0:|5, II:I5 and I 6: I5 are brought out to points X, I,1I, III and IV, which may be, for example, receptacles for receiving aplug contact fastened to a exible wire 93 leading to xed contact |55 oflimiting relay L and to its magnet I5I. In this manner, these elementsof relay L can be selectively connected to any one of contacts4:|5,|`|:|5, |0:|5, |3:|5 and |6:I5. Contact 23:I5 is connected throughlead 94 to stepping switch 35 of switch P and also to fixed contact |58of limit relay L.

The wiper y2li of selector switch I6 is connected through wire 95 toarmature switch |42 of control relay C andthat terminal of magnet |4|which is joined to said switch. The contacts of selector unit I6 areassociated with the digit busses as follows: Contacts I:I6, 2:|6 and3:|6 are connected to busses h, t, u, respectively, whereas every fourthof the remaining contacts is connected to the same bus h', t', u',respectively,

that is,`4:||i, 1:|6, I0:|, etc., are connected to h; 5:|6, 8:|6, I|:|6,etc., are connected to t', etc. As mentioned before, the presentembodiment of the invention provides for the transmission of codesignals comprising manifestations arranged in code series representingtwo different number groups of three digits, each digit being made up ofthe appropriate number of individual strokes or other impulses. In thepresent instance, it is possible to transmit first a number grouprepresenting a special signal and subsequently a number grouprepresenting a box number, which box number can be repeated from one tofour times.

The circuit of Fig. 1 is set up for transmission of the signal 2| 3,4I2, 4|2, by connecting number and digit busses, as above described, andby connecting wire 93 through plug 90 and receptacle II to contact I0:I5, which set up provides for transmission of the above signal, the boxnumber being repeated two times, as will become apparent from thefollowing description of the operation of the new system. In describingthe operation of the system according to Fig. 1, it is also assumed thatit is desired to send signals at fast speed, switch O being in theposition shown.

In order to transmit the signal selected in this manner, it is onlynecessary to press the push button |00 of starting key K, therebyconnecting contacts |0I, |03 and |02, |04, respectively. The closing ofthe latter contacts establishes, through leads 14 and 16, a motor supplycircuitfrom the secondary of transformer |29 through15-I25-14-I04-I02-16 back to |29. Upon being supplied with energy, motor|22 begins to run at its prescribed speed, and impulse switch |20 ofimpulse sender I connects contacts ||4 and |I5 during, say, the rst andthird quarter of each revolution of shaft |2I, and contacts I|4 and I I6 during the second and fourth quarter. Member r|0| of starting key K isdepressed together with |02 until it reaches contact |03. At this time,follower switch I|4 is either in the position shown, contacting with II5, or will soon be in that position, since motor |22 is started at thesame time and changes the position of the follower even if the startingkey |00 is released after a comparatively short time. Connection beingestablished at IOI-I03 and II4-II5, a circuit from minus pole throughmagnet 4| of maintenance relay M-lead '|8- |03I0llead 80-contactII5-follower switch |I4 to plus pole is closed and magnet 4I energized.Magnet 4I attracts its armature members and closes switches 42, 43, 44,thereby establishing the following circuits. A holding circuit formagnet 4I is closed from minus through 4|428|5253 to plus. A`motorholding circuit is closed from transformer |29 through16--43-14-|25'-`|5 back to |29. These two holding circuits areestablished immediately when the starting key is operated, and thelatter can now be released. without causing any change in the conditionof the circuits as established at this time. 'I'hat is, magnet 4|remains energized and motor |22 continues to run .regardless of theposition of members I 0I and |02 of the starting key and of the positionof follower 4. Magnet 4| also closes, and retains closed impulse switch44 which establishes, during each of the two periods of each revolutionof disk III when follower |I4 touches contact IIS, connection frompositive through follower |I4-I |6-64-6l of change-over switch O-'l2-44to impulse wire 11. 'This connection is ini device will perhaps beeasier comprehended by consulting the straight line diagram of Fig. 3,wherein the magnets and contacts are separated in such a manner as torender the tracing of the various circuits comparatively simple. `Inorder to permit convenient reference to Fig. l, the numerals of certaincircuit elements are in Fig. 3 preceded by the letter of theirrespective circuit component. For example, contact |45 of control relayC is in Fig. 3 designated by the symbol C |45, and, magnet' |4| of thesame relay by C |4I, indieatingthat both elements are parts of relay C.It should also be remembered that impulse wire 11 with branching point10 is connected to positive whenever follower ||4 contacts with IIB, andhereinafter the circuits including the impulse wire need only be tracedVto point lltinstead of to positive through contact II4.

Assuming now that point 10 has just become positive (upon ||4 contactingwith IIB), actuator magnet 3| of transmitting or impulse counting switchT is-energized through stepping switch 32 which Anormally connects tominus. Switch 32 is thereupon attracted and, as described before,remains in this position so long as actuator magnet 3| is energized. Atthis stage of the operation 3| remains energizedso long as 10 ispositive, since the gap between 32 through 38 to minus is bridgedthrough leads 83- 84-wiper 22--8If-I45--I44 lead 86-4wiper 2|- minus.Therefore, during the existence of this connection, 3| is onlyenergized, and wipers 2|,

22,l 23 advanced one step when follower ||4 leaves IIB. It should benoted' that this connection bridging 32-38 exists so long as wipers 2|and 22 remain on interconnected contacts I:|I`

to I||:|| and |:I2 to |0:|2, respectively. It should also be noted thatactuator magnet 34 of pause or sequence switch P is at this stage notenergized, as will be apparent by tracing the connections from steppingswitch `35, normally contacting with 39, which lead to selector contacts22:I| and 23:|5.

It is further apparent that alarm relay R is deenergizedl whenever4 the-circuit from 1li through VII---I43 of control relay C--I4Ii-82- |53 oflimiting relay L-I56-1I-62-56- 13-4I44-86' wiper 2|minus is interruptedat ||44|I6 of the impulse sender I. again that one signal manifestationas, for example, one stroke of a lbell, corresponds to eachdeenergization of R or R, each interruption yat II4-II6, ordisconnection of point 1U, produces suchv a stroke. Hence, wipers 2 I,22 and 23l movel now in unison one step at each discnnection of pointAlll or each half uturn of shaft` 12|,I untilV wiper fr,23 reaches thefirst, selector contact plugged in or otherwise selected at the digitsetter D. In the present instance, contact 3:|3 of selector unit j|3(transmitting or impulse counting switch T)V is connected to contact|:I64 of selectorlunit I5 (pause or sequence switch P) through numberbus 2 land digit bus h; Since the wipers advance, and alarm relay Risdeenergized at each interruption at ||4| I5, of the abovetracedlcircuitfvrom plus'through TIL-11-|43-|46-82-l53l5tf-ll-62-f66-R-13w |44852| to` minus, a signal stroke isgiven by alarm relay R at each advance of the wipers.

Therefore, 4the wipers of T have now advanced I twice.' wiper 23 restingat contact 3: I3, and two Assuming Anext opening `of impulse contacts.nection at 32--38 to minus, establishes a circuit from the plus pole at53 of stopping relay S through 52--3I--42--18-l9-I4i--95-wiper26-contact IS-bus h-2-32 I3-23 to 35, and from there to negativey at 38through 83 and 32, as well as to negative at 2| through 34--3: |2-22-81-|',45-|44-863: |-2|. This circuit energizes magnet I4I of controlrelay C which thereupon attracts its armature members, dis-v connectingcontact |43 from contact |46. This interrupts the aforementioned circuitwhich in cludes alarm relay R, thereby preventing energization of thatrelay (and therefore signal strokes due to following deenergization), solong as contacts |43 and |46 are separated. Energized'magnet |4I alsoattracts member |42, thereby closing contact |42-|44 and subsequentlyopening contact I44--I45. Contact |42-I44 establishes a holding circuitfor magnet |4I, from positive at 53 through 52-8I-42-18.13|4I-|42I44862I to negative, which retains |4| energizedindependently of the position of wiper 23.. -It should be noted thatthis holding circuit of magnet |4I includes selector unit and can onlyremain closed so long as wiper 2| remains on the contacts which areconnected to wire 86, that is, contacts I:|| to' |0:I|.

The opening of contacts I44-I 45 interrupts the l aforementioned shuntof contacts 32-38, which,

'through 32 whenever the latter contacts 38,

whereupon it attracts 32, is deenergized, and'so on, thereby vibratingand quickly advancing wipers II, I2 and I3. The wipers pass thus quicklyover `their respective `'contacts whereby magnet |4| remains energizedthrough the interconnected contacts of selector unit I When the last ofthese contacts, namely I: I, is passed, lmagnet |4| is deenergized andits switches restored to normal. However, alarm relay R can not yet beoperated by impulse switch |20, because its energization circuit leadsthrough selector switches or I2, both of-which now interrupt thiscircuit since their wipers have passed the connected contacts. Steppingswitch 32 continues quickly to advance its wipers until wiper 23 reachescontact |3:I3 which is 'directly conagain directly energized through 10,and 32 remains stationary until 3| is deenergized'after the I |4| I6.'Thereupon 32 steps its wipers once, 23 leaves conwipers advance againquickly. The connection of contact I3: I3 .to negative and the ensuingoperation have 4the purpose of making 'all pauses between digitssubstantially alike, as will be evident by considering that, no-matterfrom which' of the impulse switch which is the same no matter from whichselector contact wiper 23 commenced to vibrate.

last but one contacts of their respective selector units. It will benoted in this connection that the passing of wiper 23 over the contactsjoined with each other, and to contact 3: I5 of selector unit I5, is ofno consequence at this time, since wiper 25 of unit I5 rests then at theidle contact I: I 5.

Upon arriving at contact 22: I3, wiper 23 connects magnet 3 I directlyto negative, thereby stopping the quick 'advancement of the wipers of T,with these wipers at the aforementioned penultimate selector contacts.Wiper 2| at contact 22: I I establishes a circuit from negative through2 |22: I I-IlS-I 54-| SB-actuator magnet 34- 13 to plus at followerswitch ||4 so that actuator magnet 34 of pause switch P is energizedand, upon the next disconnection at ||4| I6 advances the wipers 24, 25and 26 of control switch P one step, so that wiper 26 rests now atcontact 2: I6 which is connected to digit bus t. Wipers 24 and 25 are atunconnected contacts 2: I4 and 2: I5, re-

spectively. As will be understood withoutfurther explanation, theinterruption at impulse contacts I |4| I6 also advances the wipers oftransmitting switch T, which stand now at the last contacts of theirrespective selector units. Since contacts 23:|2 and 23:|I areunconnected, but 23:|3 is connected to negative, the next interruptionat |I4| I6 advances these wipers one step further to their initialpositions where their opposite, heretofore idley brush arms contact with|:I2 and I: I3, respectively. It'should be nted that, since contact 23:Il is idle, actuator magnet k34 of pause switch P remains denergizedafter the one step advancement of its wipers, which therefore remain attheir above-indicated positions at the second contacts of theirrespective l selector units.

The elements of the circuit are now in the same position as at thebeginning of the transmission of the first digit 2", with the onlydiierence that the wipers of pause switch P have advanced one contact,that is, as pointed out before, wiper 25 rests at the selector contact2: |6 which is"con nected to the tens digit bus t. 'I'he following op-,-eration is exactly like that for the hundreds digit, and` at theend 4ofthe transmission-of the tens digit the wipers of P are located at/thethird selector contact, that is', 'wiper` 25 rests 'at 3:|5- which isconnected to the five interconnected contacts ||:I3 -to 2|:I3 oftransmitting switchl'l. The transmission of the third, or unit digit nowcompleted from actuator switch 32 through 33-35-23-I1: |3--38--3r I525to negative, that' is, magnet 3| is now directly on negative i and cannot quickly advance the wipers of transmitting switch T to thepenultimate contacts. but 'can only advance them step by step at eachinterruption at impulse contacts ||4-||'5, until lthey arrive at thesepenultimate contacts, namely, 22: I 22: I2 and `22: I3, respectively.Contact 3: I5 and wiper 25 are then again-disconnected but magnet 3|remains directly connected tonegative, which connection is accomplishedthrough 22: |3-23-l5-33. As described above, the wipers of P advance onestep, wiper 25 arriving at 4:|5 and wiper 25 at 4:|5, which is connectedto box number digit bush', and the wipers of T are restored to theirinitial position. n

It will now be evident that a uniforni"digit pause" corresponding to oneimpulse period or interruption at ||4.-| I5, or one step'of wiper 23, isprovided between two subsequent strokes of one The wipers 2|, 22, 23pass now quickly on to the digit; that a -number pause, similarlycorresponding to the four steps of wiper 23,(at I: I3, I3: I3, 22: I3and 23: I3) is provided between consecutive digits of one number, andthat a group pause corresponding to one lstep of wiper 23 at |3:|3,sevensteps from |'|:|3 to 23:|I| ,I and one step at I3 (a total of ninesteps) is providedbetween numbers.

With the relays in the position above indicated (wipers of transmittingswitch T ininitial position and wipers of P on fourth contact), thedevice according tothe invention begins to transmit the box number setup with the aid of busses h', t', u', in a manner identical to that,above described for sending the special signal. There is again aV pauseequivalent to one stroke between the strokes, a fourestroke pausebetween digits, and a nine-stroke pause between numbers. If it isdesired, as, for example, in the present set up,

to vsend the boxl number twice, round plug 30 is connected to round jackII.

In theassumed instance, after having transmitted th`e\last stroke of thelast digit of the second repetition of the box number group, wiper 25has reached contact |0:|5 (connected, with round jack II) wiper 23stands on contact 22: I3 and wiper 2| on 22: I I, waiting for aninterruption at contacts ||4| I6 of the impulse 'sender to be shifted tothe last contact. At this stage. however, a circuit is established fromminus at wiper 25 through Ill: |5-II-90-93-magnet |5|1918428|5253 toplus, which circuit energizes magnet |5I of the limiting relay L,

which thereupon attracts its armature members |52, |53 and |54. Contacts|52|55 establish a holding circuit for |5| from negative at |52 through|5||55-I5I-19-16-42-8I-52--53 to plus, which remains closed as long asmaintenance magnet 4| remains energized. The separation of contactsI53-I56 interrupts the energization circuit of alarm relay R, which isfrom now on incapable of manifesting signals. 'Ihe attraction of member|54, which'has up to now shunted contacts 35 and 39 of pause switch P(preventing vibration of actuator switch-315) directly connects minus at|51through |54-35- 39-35-34 to 10, causing actuator switch 35 tovibrate. Wipers 24, 25, 26 are quickly advanced during the periods when||4| I6 contact, ntll they reach. the last contacts of "their selectorthat all six wipers stand now on the last contactsoftheir selectorunits. Wiper 24 oncon'A `tact 23:'I4 thereupon establishes a circuitfrom plus at 24 through V23: |4`9|5| of the stopping relay S tonegative, which circuit energizes the lslowly releasing magnet 5|ofrelay S. Magnet 5| attracts its armature 54, thereby shifting'thelpositive supply connection of maintenance mag- 'throughapoint'll switch44 and impulse sender contacts II4-I I5. At the next interruption ofthiscircuit at.|I4-||6, all wipers are,n 1oved" home into their initialpositions'. `Magnet. is

dee'nergized'. by the brea at 23,: I4 and drops its armature switches42, 43, 44. stopsmotor |22 at '43, opens the holding circuit of magnet4| units. Wiper 25 arriving at 23: I5 puts 34 again directly onnegative' and stops it vibrating, so takes place in the same manner,untilwiper 23 l reaches contact I3. At this stage, a circuit is at 42and disconnects impulse wire Tl. at '44,' Magnet |5| of limiting relay Lis thereby deenergized.v

Shortly fafterwards, armature 54 o f'magnet 5| oi' stopping relay S hasdropped so'- that the Iwholemitting switch T in such a manner thatcontacts n is energized when wiper 2| engages contact 22: II

`whereupon wiper 26 of unit I6 advances one step onto contact 2: I6.Wiper 23 moves over the selector contacts of unit I3 without initiatinga signal stroke, as will now be apparent without detailed explanation ofthe connections and circuits involved.

If transmission of the special signal only is desired, plug 90 isconnected to receptacle X so that signal transmission is terminated withthe la'st `stroke of the unit digit of thespecial number.

It will now,be evident that the signal presetting device of Vtheinvention, combined with the automatic transmission of the prearrangedsignal, provides for visualization, and therefore almost certaincorrectness of the number 'to be transmitted, which excludes any errorsduring repeated transmission thereof, as invariably occur when thesignal impulses are manually repeated, for example, with the aid of atelegraph key.

The embodiment-shown in Fig; 2 is essentially identical with that f Fig.1 with the exception that the digit setting device D is,` in this modi-4iication, replaced by a number distributor or pre-` selector N and digitautomat A which, together with holding relay H, actuating relay G, andalarm circuit relay F or telephone dial E, permits the automatic settingup or storing of code signals, and the subsequent automatic transmissionof these signals.

The number distributor N is substantially a telephone selector switch of`a Well known type and comprises a 'selector unit 2||J with a row of tenselector contacts whichv will herein be referred to as |:2'I0 to |0:2I0,-respectively, a'single arm wiper 220,-anaotuator magnetZ I4, arestore magnet 224 and a retaining, switch 230. With this type ofselector switch, thewiper contacts initially with the iirst contact|:2||l', is moved one step by each deenergization of actuator`magnet2|4,

,andy restored to initial'position at I:2|0 'by rey store magnet 224when the latter is energized. f lThe retaining switch 230 is closed whenthe actuator magnet 2|4 is first energized, and remains closed `untilthe wiper is returned to its initial position. Switches of this kind arequite similaru to the more widely used type where a control switch isnot closed until the magnet is ,dee'nergized; the only difference isthat switch 23|) is closed by the initial energization' ofmagnet 2|4instead of its first deenergization.

The digit automat A consists essentially of three selector switches likethat of distributor N ,3 and has three selector units` -2I I, 2|2,2|3.with wipers22I, 222, 223, respectively, actuator magnets 2|5,2I6,..2|1, respectively, and restore magnets 225, 226, 221,respectively. These three se-J lector switches operate 'i'ndepe'ndentlyof each .other similar to distributor N, with the exception 'that onlythe first one is provided with a retaining switch 23| which is closedwhen actuating magnet 2|5 is energized and openswhen the wiper ofthis-magnet returns to initial position. As shown in Fig. 2, thecontacts of units 2| I, 2|2, 2I3 are joined to the number busses oftrans- I:2|I, |:2I2, I:2I3 are connected to bus il, contacts 2:2I I,2:2I2, 2:2I3 to bus I, etc., corresponding contacts of each unit beinglassociated with the same number bus. Wipers 22|, 222, 223 are connectedto digit busses h", t,u, respectively. The contacts of 4selector unit I6ofpauseswitch P are connected to the digit busses in groups of three,that is, contacts |:|6, 4: I6, 1:|6 are connected to `bus h; 2; I6, 5:I6, 6: I6 are connectedto t"; and 3:|6, 6:I6, 3-:|6 are connected to u".

The terminals on one side of each restore mag` net 224, 225, 226, 221are connected to negative as indicated, the other terminals are joinedand connected, through lead 96, to wire v9| which leads as in theembodiment of Fig.- 1, from contact 23: I4 to stopping relay S. Theterminals on one side o`f each actuator magnet 2I5, 2|6, 2|1 of automatA are connected to contacts of the number distributor N, as shown,magnet 2I5 being associated with contact 2:2I0, 2I6 with 3:2Ill and 2|1with 4:2IIJ. Contact |:2I0 is idle.

\negative yand energized, and the entire circuit conditioned inoperativefor signal transmission, as will be readily understood from thefollowing description.

The holding relay H comprises a magnet 24| which controls switch members242 and 243 cooperating with viixed contacts 244, 245 and 246. Magnet24| is normally energized, retaining members 242 and 243'in raisedposition and in contact with iixed contacts 244, 246, respectively.Magnet 24| is of the type which attracts an armature quickly, butreleases it slowly, having, for example, a copper sleeve mounted on themagnet core. after a predetermined period, fixedcontacts 244 and 246 aredisconnected, whereas contact 245 -connects with member 242.

Actuating relay G has amagnet 25|, three When members 242 and 243 arereleased armature members 252, 253, 254 and three fixed contacts 255,256, 251. Magnet 25| is likewise of the retarded type, but'releases itsarmature still slower than magnet 24| of holding relay H,

as indicated by its longer sleeve. The delayv periods of magnets 24| andl25| must be'properly timed with lrespect to the operation -of thesignal` storing device as a whol, in a manner which will be evident from'the following description. Magnet 25| is normally deenergized, and inthis condition members 252--255 and 2,53-256, respectively, contact,whereas memberswv254' and 251 are disconnected. Upon energization ofmagnet 25|, contacts 252--255 and 253--256, re-

spectively, are vdisconnected andA 254-251 -are connected. i i 1 Thefire alarm circuit relay Fi(hereinafter referred to as kiire relay) hasa magnet 26| and, a switch member 262 associated with iixed contacts 263and 264. Magnet 26|` is normally energized, since it is assumed tobe-partof a conventional nre alarm circuit which carries current undernormal conditions and contains alarm boxes and manifesting relays(corresponding to relay F) in series connection. The'code signalimpulses are transmitted as circuit interruptions, each interruptioncausing a deenergization of magnet 26| in a manner to be described indetail hereinafter. Contacts 262 and 263 are disconnected, and contactis established between members 262 and 264, at every deenergization ofmagand 212 and normally separated oilf normal contacts 213, 214 and 216.When dialing commences,-contacts 213, 214 and 216 close. They remainclosed during dialing, but are open whenever the dial is at rest.Impulsey contacts 21|, 212 are opened during the eiIective returnmovement of the dial a number of times corresponding tothe number ofimpulses to be transmitted for each dial turn. In other words, when, forexample, the operator dials 213 and begins to turn the dial diskclockwise, switches 213-214- 216 close. When the disk returns, contacts21|-212 open and again close two times, and then 213-214-216 open again.When the tens `digit one is dialed,v213214-216 close, 21|- 212 send oneimpulse by opening once, and 213-214--216 open, and similarly for theunit digit.

As shown in-Fig. 2, one terminal of magnet 24| is connected to negative,and the other to contacts 263 and 216. Contacts 242, 264, 214, 261,contacts 243, 263 and contacts 212,l 213, 264, respectively, are joinedin three groups and contact 262 is connected to the positive terminal ofthe battery. Actuator magnet 2I4 of distributor N is connected betweencontacts 246 and 243 through wire 28|, and the negative terminal ofthebattery. Wiper 220 isjoined to contact 232 L of the retaining switchand througnwires 232 contacts 233 and266, through wires 33 and 63,

and 233 to contacts 244 and 266. Through lead 233, contact 233 isconnected to one terminal oi' magnet 26| of actuating relay G whoseother terminal leads to the negative'side of the battery.

Instead oi being manually controlled like starting key K of themodication according to Fig. l, starter key K of the present embodimenthas a magnet 260 whose. terminals are connected to 55 respectively,.andwhich, upon energization, con- "as'describedin connection wlthFigs.4lfam'i 3,1nand 7 l This embodiment incorporating the automatic/' signalstoring d evicejas shownl in Figs. 2 `and 6. operates as follows:4Assuming that it 'is desired nects contacts "I3-23| and |34 '232,.respectively. Maintenance relay M of this" `embodi ment has anyadditional contactl 43 connecting` ,with armature member 42 when .magnet.41 is w deenergized. Frm contact 43 leads afwire 31 tov switch 233.with contacts'232and 233. Contact., 232 is'connectedto dial contact21|,through'lead 233, and contact 233 is joined to switch member 232oi." ilre relayF. 'By shifting switch 233 con- 1 trol ofthedigitautornatcan be transferred vfrom ilre relay- F to telephone dial E.and ;v.'ice versa.

The remainder of the circuit is organized exactly need not be repeated.

.to .store fand' to transmit code signals arriving from a conventionalnre^ alarm circuitfswlich 2961s positioned as shown, connecting lead 91with armature member 262 of normally energized re 4relay F. A circuit isthus established from positive at 63 through 49-91-290-263-24I tonegative, which circuit normally enegizes magnet 24| of holding rela'yH. Contact is therefore maintained at 242-244 and at'243--246, duringnormal conditioning of F, and a certain period after magnet 26| isdeenergzed, which period corresponds to the time lag of magnet 24|. Aspointed out before, relay F may be part of any conventional signalingsystem transmitting signals in the form of current modications arrangedaccording'to a code. In the present instance it is assumed that codesignals vmanifested at F are of the conventional ireI alarm` type, asillustrated in Fig. 4. 'I'his timing diagram indicates the periods(identified by letters a, b, c, etc.)jwhen magnet 26| is energized anddeenergized, respectively, the` code signal received at F representingthe number of a fire alarm box, for example, 213".

At the moment a when magnet 26| is first deenergized, armature switch262 of relay F drops, establishing connection at 264 but breakingcontact at 263 and deenergizing magnet 24|, which, however, as alreadymentioned, releases its armature members 242 and 243 only a certain timeafter its deenergization. Hence, a circuit is closed from positive at 63through 262-264-242-244- 232-233--266-263-243-246-28 |-2 I4 to negative.This circuit energizes actuator magnet 2 I4 of number distributor orpreselector N. At the same time, retaining switch 23o- 232 closes due tothe construction oi' device N as described hereinabove and establishes`a circuit from plus at 63v` through 2 32-232-233-233-261 to negative,en- I ergizing magnet 26| of actuating relay G, which immediatelyattracts its armature members 262, 263 and 264. Member 263 opens theabove-traced energization circuit of stepping magnet 2|4,`

whereupon wiper 223 advances one step from unconnected contact A Member242 oi' H havingnot yet been released, a circuit is established frompositive `through 233 232 234 242 244- 282-wiper 220- 2:2|3-2|6 tonegative, energizing actuator mag- ,net 2| 6 of automat A and closingretaining switch -so thatV contacts 262 and 263 are still open. Itshould also be noted that the closing of retaining switch 23| o! automatA has as yet no effect since its circuit is open at' 266 of G.' Theinterruption. at 232- 234 opens the energization cir- -cuitof actuatormagnet 2I6 which thereupon advances wiper l22|. one step from selectorcontact `2|6-negative is again closed, energizing stepping magnet 246 asecond time. There has now been reached the number pause between pointsc and d of Fig. l4. during which magnet 23| remains .through contact3:2||.

deenergized. The retarding device of magnet 24| is so designed that itsarmatures drop away after a period from the last deenergization(indicated at c of Fig. 4) which is shorter than the time interval c-d,and therefore the energlzatlon circuit of stepper magnet 2|5'is nowinterrupted at 242-244 and stepper 22| is again advanced one step,making connection with number bus 2 Contacts 262- 264 and 242-245reestablish the energization circuit for actuator magnet 2|4 ofdistributor N, since -relay G is so timed that its armatures will notdrop away during the period c-d and a certain period thereafter.

At the beginning of the manifestation of the next digit one (pointd),.magnet 26| is again energized, and therefore also magnet 24|, aswill now be evident. Magnet '26| attracting member 262 openstheenergization circuit ofv actuator magnet 2|4 at 264 (the circuit is alsobroken at 245) and wiper 220 is moved another step forward to contact3:2Ili, establishing connection with actuator magnet 2|6 of selectorunit 2|2 of the `digit automat.0 As will now be apparent, the nextdeenergization '(at point e) of magnet 26| causes stepper magnet 2|6 tobe energized. 'I'he next p eriod being again a number pause,` relay 24|drops its armatures at point e', deenergizing stepper magnet 2|6 andadvancing wiper 222 one step, from l|:2I2 to contact 2:2l2, connectedwith number bus I.

The nextand last digit three is tthen set up by moving wiper 223 threesteps to contact 4:2I3 connecting with number bus 3, in a manner whichwill now be understood Without further explanation.

After the last digit stroke is set up there ensues a` pause, between thenumbers of a so-called round of signals manifested at 26|, which pauseis longer than those between the strokes' and the digits of any number,and during whichl the signaling circuit and magnet 26| are not carryingcurrent. Magnet 26| is thereforev deenergized during this pause(beginning at point l of Fig. 4) and retaining magnet 25| isdeenergized, which nally releases its armatures at point l' of Fig. 4.It thereby closes contacts 252 and 255", establish- Ving a circuit fromplus at 252 through 255--98 200--99-233--23l to negative. Magnet .200 ofthe starter K is therefore energized, and lifts its armature contacts20|, 202 into contact with ilxed contacts |03 and |04. I

This operation of starter K' has exactly the same eiect as the pressingof the starting key described in connection with Fig. 1,l namely, thetransmission of the stored code signal for manifestatlon at relay R. Itwill of course be understood that the circuits from the number bussesthrough the wipers' of .the digit automat to the digit busses h, t", u"(as, forexample, from number bus 2 through 3:2||-22 r-g-h", to |:I6correspond exactly tothe manually plugged connections at digit settingdevice D of; Fig. `1, withA the hereinbefore mentioned difference thatthere is'no4 provision made for setting up aspecial. number since the realarm circuit transmits only a.

box number. I A,

At the end of the transmission of a; predetermined number of codesignals (in the present case two number groups, since plug 9i) isconestablished from. plus at wiper 24 through energizing said drivingmeans, means Hence, a circuit is 23: |4-96--restore magnets to negative,the restore magnets are energized, the wipers of N and A restored toinitial position and switches 230-232 and 23|-233 opened. The openingofv 23|233 deenergizes magnet 200, so that the entire circuit is nowrestored to its initial condition. e

. If it is desired to set up a code number and to transmit it a certainnumber of times merely by dialing it nce on a conventional telephonetransmitter, switch 290 is turned to make contact at 292. It will beevident that the operation of the dial initiates current impulses whichcorrecommencement of dialing and remain closed during the entire dialingperiod. During closure of these` contacts, relay 24| is energized fromminus pole through 215--214-213-212-21l- 292--290-91-49--42- 8|5253 toplus pole. Therefore, although relay 24| is deenergized when the dial isat rest, it becomesenergized as soon as dial operation begins, and thefurther operation proceeds exactly as in the case when the device isconnected to relay F, regardless of the fact that relay 24| isdeenergizedwhile dial mechanism E is at rest. Without any furtheroperation the number is repeated into the re circuit and manifested withthe aid of relay R a number of times which can be determined by.properly connecting plug 90 of pause switch P, whereupon the circuit isautomatically restored toinitial condition and ready for transmission ofanother signal.

It should be understood that the present disclosure is for the purposeof illustration only and that this invention includes all modificationsand equivalents which fall within the scope of the appended claims.

1. An electric code signal transmitting device comprising output`contacts for connection with a signal receiving circuit, means forsupplying current impulses at regular intervals to said contacts,maintenance means normally disconnecting Isaid contacts from saidimpulse supply means, normally deenergized driving means for4 saidimpulse supply means, means for operatively for closing said maintenancemeans, holding means maintaining the energization of saiddriving meansand the connection of said contacts, contact means in series with saidmaintenance means for disassociating saidimpulse supply means from saidcontacts after reception of a predetermined number of impulses, meansfor reclosing said contactv means after omission of ,a predeterminednumber of receptions, and means said holding meansafter reception of apredetermined number of4 impulse groups.

2.Acode signal transmitter comprising means for supplying code signalingimpulses at regular vintervals throughout the transmission of anintended code signal and for supplying a starting impulseduringthe'interval between each of the signaling impulses, an impulsecounting switch having a stepping magnetoperable by said signalingimpulses, a sequence switch having a stepping magnet likewise operableby signaling impulses, a maintenance relay in a normally open alarm sfor inactivating starting circuit said relay being energized in responseto said starting impulses during closure of said starting circuit andhaving a transmitter control circuit for initiating and maintainingoperation of said switches throughout energization of said maintenancerelay and a locking circuit holding said relay energized, a controlrelay, means for supplying said impulses to said counting switch, neanssupplying a signaling impulse to said sequence switch for operationthereof at a predetermined position of said counting switch, circuitsincluding said switches for controlling said control relay jointly bysaid switches for interrupting the supply of said impulses in responseto predetermined positionings of said switches, to formulate saidintended code signal, and a stopping relay controlled by said sequenceswitch for interrupting said lockingV circuit following completetransmission of the signal.

3. A code signal transmitter comprising means for supplying codesignaling impulses at regular intervals throughout the transmission ofan intended code signal and for supplying a starting impulse during theintervals between each of the signaling impulses, an impulse countingswitch having a stepping magnet operable by said signaling impulses, asequence switch having a stepping magnet operable by said signalingimpulses, a maintenance relay in a normally open starting circuit saidrelay being energized in response to said starting impulses duringclosure of said starting circuit and having a transmitter controlcircuit for initiating and maintaining operation of the Said switchesthroughout energization of said` maintenance relay, a control relay,means for supplying said impulses to said counting switch, meanssupplying a signaling impulse to said sequence switch for operationthereof at a predetermined position of said counting switch, andcircuits including said switches for controlling said control relayjointly by said switches for interrupting the supply of said impulses inresponse to predetermined positionings of said switches, to formulatesaid intended code signal.

4. In a code signal transmitter, means for supplying to a signaltransmitting circuit code signaling impulses at regular intervalsthroughout the transmission of an intended code signal, two selectorswitches each having a plurality of contacts and a stepping magnetoperable by said impulses for establishing connections step by step withconsecutive ones of said contacts, a plurality of code setting circuitseach comprising means for-establishing a connection between any one ofcertain of the contacts ofI` one of said switches and any one of certaincontacts of the other of said switches, a relay energized throughrespective ones of said circuits when connection isiv establishedtherewith through said switches concurrently, said relay having contactsoperable in response to energization thereof for interrupting the supplyof codesignaling impulses to said signal transmitting circuit, therebyformulating groups of signal impulses constituting a code signal unit,means for supplying said impulses to one of said switches, and means forsupplying, after said rst switch has advanced a predetermined number ofsteps, one impulse to the second one of said switches, for changing theeffective contact of said second switch, after formulation of-a codesignal unit through operation of said rst switch.

5. In a code signal transmitter, means for supplying to a signaltransmitting circuit code signaling impulses at regular intervalsthroughout the transmission of an intended code signal, two selectorswitches each having a plurality of contacts and a stepping magnetoperable by said impulses for establishing connections step by step withconsecutive ones of said contacts, means for preparing connectionsbetween predetermined contacts of the respective switches, a relayenergized by concurrent connections, through said switches, of a contactof each of said switches for interrupting the supply of code signalingimpulses to said signal transmitting circuit to formulate an intendedcode signal therein, means for supplying said impulses to one of saidswitches, and means for supplying one impulse to the second one of saidswitches after said rst switch has reached a position corresponding to acertain number of steps, to change the contact connection of said secondswitch after formulation of a signal by a preceding contact combination,for preparing the formulation of a subsequent signal.

6. An electric code signal transmitter circuit comprising means forsupplying code signaling impulses at regular intervals throughout thetransmission of an intended code signal, an impulse counting switchhaving a stepping magnet operable by said impulses, a sequence switchhaving a stepping magnet likewise operable by said impulses, means forpreparing circuits made effective by certain positions of said switchesacontrol relay, and means, controlled by one of said switches, foroperating the other switch to change its contact connection afterformulation of a signal by a preceding contact combination, forpreparing the formulation of a subsequent signal, said relay beingjointly controlled by said switches for interrupting the supply of codesignaling impulses at predetermined positions of said switches toformulate an intended code signal, means for supplying said impulses toone of said switches, and means for supplying one impulse to the secondone of said switches after said first switch has reached a positioncorresponding to a certain number of steps, to change the contactconnection of said second switch after formulation of a signal by apreceding contact combination, for preparing the formulation of asubsequent signal.

7. A code signal transmitting device comprising a signal receivingcircuit; means for supplying to said circuit current impulses at regularintervals throughout the transmission of an entire code signalcommunicatiom'in series in said circuit; a stepping switch including anactuating magnet and an automatically interrupting quick actingenergizing means for said magnet in series to said impulse supply meansand in parallel to said circuit; means for initially shunt'- ing asignal receiving circuit; means for supplying to said circuit currentimpulses at regular intervals throughout the transmission of an entirecode signal communication, in series in said circuit; a stepping switchincluding an actuating magnet and an automatically interrupting quickacting energizing means for said magnet in series to said impulse supplymeans 'and in parallel to said circuit; means for initially shuntingsaid energizing means and periodically energizing said magnet throughsaid impulses; means' disassociating means and simultaneously dis-`associating said impulse supply means from said circuit."

9. Code signal transmitting means comprising a current source; a signalreceiving circuit;-

-means supplying from said current source impulses at regular intervalsto said circuit; a normally closed cutout intermediate said supply meansand said circuit; a digit setting device having two series of conductorsand means for selecting connections between conductors of differentseries; an impulse counting stepper magnet and a quickly interruptingand reclosing vibrator switch connected to said source in series withsaid impulse supply means and in parallel to said circuit and saidcutout; means normally shunting said vibrator switch controlled by saidmagnet; a first stepping switch actuated by said impulse countingmagnet, vhaving a wiper connected to said magnet in parallel with saidvibrator, a series of contacts with a number of consecutive contactsconnected to one conductor series of said setting device, and asynchroni-zing contact following said initial contacts connected to saidsource; a sequence stepper mag/net connected in series to said impulsesupply means; a normally open energizing contact closed by said impulsecounting magnet towards the end of its cycle of operation, in series tosaid sequence magnet; a second stepping switch actuated by said sequencemagnet having a wiper and" a series of contacts connected to the secondseries of conductors of said setting device; and a control magnet inseries with said second stepping switch and upon energization openingsaid cutout and said shunting means; said stepper contacts and wipersbeing so coordinated that each current impulse reaches said circuitandenergizes said impulse counting magnet until said first wiper reaches acontact connected by said setting device with said second steppingswitch, said control magnet thereupon opening :said cutout and .openingsaid shunting means thereby causing said impulse counting magnet toadvance its wiper quickly until said synchronizing contact is reached,where the vibrator is again shunted and the impulse supply means effecta further step .of th-e impulse counting magnet which again removes thevibrator shunt and advances said first wiper quickly until saidenergizing contact connects said sequence magnet/the impulse supply.means then energizing saidgsequence magnet,4

advancing said second stepping switch one contact to'connect withanother conductor of said second series and returning said firststepping switch into initial position.

l0. Code signal transmitting means comprising a current source; a signalreceiving circuit; means supplying from said source current impulses atregular intervals to said circuit; a normally closed cutout intermediatesaid supply means and said circuit; a digit setting device having twoseries of conductors and means for selecting connections betweenconductors of different series; an impulse counting stepper magnet and a.quickly interrupting and reclosing vibrator switch connected to saidsource in series with said impulse supply means and in parallel to saidcircuit and said cutout; means normally shunting said vibrator switchcontrolled by said magnet; a first stepping switch actuated by saidimpulse counting magnet, having a wiper connected to said magnet inparallel with said vibrator switch, a series of contacts with a numberof consecutive contacts connected to one conductor series of saidsetting device; a synchronizing contact following said initial contactsconnected to said source, and group-forming contacts following saidsynchronizing contact; a sequence stepper magnet connected in series tosaid impulse vsupply means; a normally open energizing conspondingcontacts of each group being connected in parallel to the second seriesof conductors of said setting device; a third stepping switch likewiseactuated by said sequence magnet having contacts at intervalscorresponding to the number of contacts in said groups connected to eachother and to said group-forming contacts and a wiper connected to saidsource; and a control magnet in series with said second stepping switchand'upon energization opening said cutout and said shunting means; saidstepper contacts and wipersl being so coordinated that each currentimpulse reaches said circuit and energizes said impulse counting magnetuntil said first wiper reaches a contact connected by said settingdevice with said second stepping switch, said conond series andreturning said rst stepping switch into initial position, said operationbeing repeated until said third wiper reaches one of its connectedcontacts, causing said vibrator switch to be shunted and to advanceslowly forming a comparatively long pause prior to repetition ofthesignal prepared with said contact group.

11. A device of the character described comprising means for manifestingcode groups. of long and short signal impulses, digit selectors arranged for establishing in consecutive positions different signalactuating circuit connections, a preselector adapted to condition foractuation consecutive ones of said selectors, an actuating cuitestablishing positions of' said conditionedl selectors during each ofsaid short impulses and a predetermined time after the beginning of eachlong impulse.

12. A code signal transmitting device comprising means for communicatingcode groups of long and short. signal impulses; normally ineffectivemeans for supplying to a signal transmitting circuit intermediate signaltransmission impulses at regular intervals; meansfor starting saidimpulse supply means; two selector switches each having a plurality ofcontacts and a stepping magnet operable by said transmission impulsesfor establishing connections step by step with consecutive ones of saidcontacts; a plurality of code setting circuits including digit selectorsestablishing in consecutive positions diierent connections between anyone of certain of the contacts of one of said selector switches and anyone of certain contacts of the other of said selector switches; apreselector adapted to condition for actuation consecutive ones of saiddigit selectors; an actuating relay controlled by said code groupimpulses, said relaycausing said preselector to condition one of saiddigit selectors for actuation during the rst short impulse, andthereafter consecutively to condition different digit selectors; meansfor changing the circuit establishing positions of respective ones ofsaid conditioned digit selectors during each of said short impulses andat a predetermined time after the beginning of each long impulse; meansfor actuating said starting means upon discontinuation of said codegroup communication for a predetermined time; and a relay energizedthrough a respective one of said code setting circuits when connectionis established therewith by each of said switches concurrently, saidrelay having contacts operable in response to energization thereof forinterrupting the supply of intermediate signal transmission impulses tosaid signal transmitting circuit thereby formulating groups of signalimpulses constituting a code signal conforming with said code groupsignals.

' FOSTER E. WELD.

